Adding a filter on a RelationManager Table with `relationship` doesn't work

On a RelationManger class, I have added a

SelectFilter

SelectFilter

to the table and using the

relationship

relationship

method to fill the Select Filter. But it doesn't seem to fill the Select.

 Tables\Filters\SelectFilter::make('Option 1')
      ->relationship('option1', 'key')
      ->attribute('option_1_value'),

 Tables\Filters\SelectFilter::make('Option 1')
      ->relationship('option1', 'key')
      ->attribute('option_1_value'),

The

option1

option1

is a

BelongsTo

BelongsTo

relationship added on the model.